Speedo malfunctioning

I have a 2000 dyna low rider and my speedo started acting up while I was crusing around 60 today. The speedo stopped working and the engine light came on. When I engaged the clutch and let it idle down, it started back working and the engine light went off. When I let off the clutch and brought the rpms back up, the speedo went to zero again and the engine light came back on. The odometer went blank also. As long as the rpms are low, there's no problem. Any help on the solution?

I replaced the speed sensor and the problem is still there. I bring up the RPM's and the odometer blinks a few times the goes blank, the engine light comes on and the speedometer stops working. At idle, everything starts back working. Bring up the RPM's and it starts messing up again. Not sure what to check next. Any suggestions?

You probably have a high voltage code. Place a voltmeter directly across the battery. Start engine and read the voltage at 3000 RPM. If it goes above 14.70 volts or is in the 15's, the voltage regulator is bad.

You probably have a high voltage code. Place a voltmeter directly across the battery. Start engine and read the voltage at 3000 RPM. If it goes above 14.70 volts or is in the 15's, the voltage regulator is bad.

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?? I don't know what your looking for in an answer? It can't be put in more basic terms.